package com.wl.gateway.filter;

import com.wl.common.core.constant.HttpConstants;
import com.wl.common.core.constant.SecurityConstants;
import com.wl.common.core.utils.StringUtils;
import com.wl.gateway.utils.WebFluxUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author: wanglin
 * @date: 2024-03-06 周三
 * @Version: 1.0
 * @Description:
 */
@Component
public class AuthFilter implements GlobalFilter, Ordered {
    private static final Logger log = LoggerFactory.getLogger(AuthFilter.class);

    /**
     * 排除过滤的 uri 地址，nacos自行添加
     */
//    @Autowired
//    private IgnoreWhiteProperties ignoreWhite;

//    @Autowired
//    private RedisService redisService;

//    @Autowired
//    private IgnoreUrlsProperties ignoreUrlList;

//    @Autowired
//    private JwtTokenUtil jwtTokenUtil;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpRequest.Builder mutate = request.mutate();

        String url = request.getURI().getPath();
        // 跳过不需要验证的路径
//        if (StringUtils.matches(url, ignoreWhite.getWhites())) {
//            return chain.filter(exchange);
//        }
//        String token = getToken(request)
//        if (StringUtils.isEmpty(token)) {
//            return unauthorizedResponse(exchange, "令牌不能为空");
//        }
//
//        String currentUrl = request.getURI().getPath();
//
//        Claims claims = JwtUtils.parseToken(token);
//        if (claims == null)
//        {
//            return unauthorizedResponse(exchange, "令牌已过期或验证不正确！");
//        }

//        // 设置用户信息到请求
//        addHeader(mutate, SecurityConstants.USER_KEY, userkey);
//        addHeader(mutate, SecurityConstants.DETAILS_USER_ID, userid);
//        addHeader(mutate, SecurityConstants.DETAILS_USERNAME, username);
//        // 内部请求来源参数清除
//        removeHeader(mutate, SecurityConstants.FROM_SOURCE);
        return chain.filter(exchange.mutate().request(mutate.build()).build());
    }

    private void addHeader(ServerHttpRequest.Builder mutate, String name, Object value) {
        if (value == null) {
            return;
        }
        String valueStr = value.toString();
        String valueEncode = WebFluxUtils.urlEncode(valueStr);
        mutate.header(name, valueEncode);
    }

    private void removeHeader(ServerHttpRequest.Builder mutate, String name) {
        mutate.headers(httpHeaders -> httpHeaders.remove(name)).build();
    }

    private Mono<Void> unauthorizedResponse(ServerWebExchange exchange, String msg) {
        log.error("[鉴权异常处理]请求路径:{}", exchange.getRequest().getPath());
        return WebFluxUtils.webFluxResponseWriter(exchange.getResponse(), msg, HttpConstants.UNAUTHORIZED);
    }

    /**
     * 获取缓存key
     */
    private String getTokenKey(String token) {
//        return CacheConstants.LOGIN_TOKEN_KEY + token;
        return null;
    }

    /**
     * 获取请求token
     */
    private String getToken(ServerHttpRequest request) {
        String token = request.getHeaders().getFirst(SecurityConstants.AUTHENTICATION);
        // 如果前端设置了令牌前缀，则裁剪掉前缀
        if (StringUtils.isNotEmpty(token) && token.startsWith(SecurityConstants.TOKEN_PREFIX)) {
            token = token.replaceFirst(SecurityConstants.TOKEN_PREFIX, StringUtils.EMPTY);
        }
        return token;
    }

    @Override
    public int getOrder() {
        return -200;
    }
}
